Coal preparation process control

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Mots clés : Coal preparation;Computer applications;Process control;Instrumentation;Automation;Coal flotation
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Texte
Sommaire: The methods generally applied to predict performance and financially evaluate beneficiation options are reviewed.
Typical costs for a western Canadian thermal coal operation are examined. Preparation—from truck dump to loadout— frequently amounts to over a quarter of total minesite costs. Failure to achieve projected yield—whether caused by mine or plant problems—substantially increases production costs because more coal has to be mined to meet a specific market...
Publication: CIM Bulletin
Auteur(s): STANLEY G. BUTCHER
Mots clés: Coal preparation, Economics, Thermal coal, Washability data, Coal cleaning, Coal beneficiation, Plant performance.
Numéro: 881
Volume: 78
Année: 1985
Texte
Sommaire: A very conductive zone was revealed in 1977 and 1978 by magnetotelluric (MT) measurements carried out near Ste-Mathilde, 6 km northeast of La Malbaie. In order to identify the structure causing the anomaly, thirty-five MT soundings were recorded in 1980 and 1981 on and around the conductor within a radius of 4 km. Results confirmed that the conductor is of limited extent (less than 2 km by 0.4 km). The proposed model is a highly conductive vertical slab, the top of which is within 200 m from...
Publication: CIM Bulletin
Auteur(s): MICHEL CHOUTEAU
Mots clés: Mineral exploration, Technology, Magnetotelluric measurement, Electrical resistivity, Conductivity, Metallic mineralization, Electrolytic solution, Graphite veins.
Numéro: 881
Volume: 78
Année: 1985
Texte
Sommaire: Refractoriness in Carlin-type gold ores results mostly from fine locking of gold in pyrite, locking in various gangue phases, notably quartz, and a "preg robbing" condition attributed to organic carbon. All three conditions may occur in any given deposit, including Newmont's Carlin and Gold Quarry deposits in Nevada, where types of refractoriness occur locally in minor amounts.
Measurements of specific gravity, water absorption and screen size distributions of gold in alteration...
Publication: CIM Bulletin
Auteur(s): D.M. HAUSEN
Mots clés: Mineralogy, Process mineralogy, Refractory ores, Gold mineralization, Gold, Water absorption, Specific gravity, Screen-size distribution, Metallurgy.
Numéro: 881
Volume: 78
Année: 1985
Texte
Sommaire: A rank-map of Crowsnest coalfield, showing the distribution of the bituminous coal measures and the locations of major structures, has been produced from vitrinite reflectance measurements on over 600 coal samples. The timing of coalification in relation to these major structures has also been determined.
In the west-central portion of the coalfield a complete stratigraphic succession of coal measures which rides on major thrust surfaces is all of high-volatile bituminous rank, but despite...
Publication: CIM Bulletin
Auteur(s): DAVID E. PEARSON, DAVID A. GRIEVE
Mots clés: Coal preparation, Coalification, Rank gradients, Stratigraphy, Coal quality, Structural setting, Crowsnest coalfield.
Numéro: 881
Volume: 78
Année: 1985
Texte
Sommaire: The paper describes current 'tools' available to the coal preparation engineer for carrying out the evaluation of data, process design, selection of equipment and layout and design of coal preparation plants.Laboratory and pilot-scale equipment is widely available and test data can be used to provide valuable design information regarding capacities and sizing for specific applications. Pilot plants, unless they fit closely to the basic design envisaged for the eventual commercial plant, can...
Publication: CIM Bulletin
Auteur(s): D.G. OSBORNE
Mots clés: Coal preparation, Process Design, Computer Modelling, Plant design, Coal cleaning, Washability data.
Numéro: 881
Volume: 78
Année: 1985
Texte
Sommaire: A program of sampling in Canadian washeries was carried out by the Coal Research Laboratory (CRL) over a period of two years to evaluate the performance of various density separators in these operations "'. Operating data on quality and recovery of products, separation efficiencies and cutpoints for each separator type are compared with data predicted using computer models developed from previously existing data.The Heavy Medium Cyclone (HMC), Heavy Medium Bath (HMB) and jig models give...
Publication: CIM Bulletin
Auteur(s): A.I.A. SALAMA, M.W. MIKHAIL, LC. BIRD
Mots clés: Coal preparation, Density separators, Coal washing, Washeries, Computer models.
Numéro: 881
Volume: 78
Année: 1985
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